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Income Taxes
3 Months Ended
Mar. 31, 2013
Income Taxes [Abstract]  
Income Taxes
9.  Income Taxes

The Company files U.S. federal income tax returns and various state and local income tax returns.  With few exceptions, years prior to 2009 are no longer subject to examination. The Company is under audit in the state of Maryland for the 2007, 2008 and 2009 tax years, and in the state of Pennsylvania for the 2009 tax year.  No other state or federal income tax audits were in process as of March 31, 2013.